JPH0999400A - Mechanism for elevating/lowering die of turret punch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate elevating/lowering of a die for forming without hindering at the time of feeding a work by arranging only one die elevating/lowering means to a turret. SOLUTION: Each die 5 for forming arranged in the lower turret 2 is made to be possible to elevate/lower. The die elevating/ lowering means 16 for elevating/lowering the die 5 from the lower part of the lower turret 2 is arranged at one position of a rotating locus L of the die 5 accompanied with the rotation of the lower turret 2, e.g. the position acted to a punching P. In each die 5, a projecting part 29a projected from the lower surface of the lower turret 2 is arranged. The die elevating/lowering means 16 is constituted with an advancing/retreating member 17 having an inclining surface part 17a, on which the projecting part 29a can run, and a horizontal surface part 17b and possible to advance/retreat in the horizontal direction and an actuator 18 for advancing/retreating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die lifting mechanism for a turret punch press in which a molding die is raised only when it is used.

[0002]

2. Description of the Related Art In a turret punch press, as shown in FIG. 5, an upper turret 1 and a lower turret 2 are installed concentrically on a frame 3, and various punches 4 and dies 5 are provided on the upper turret 1 and the lower turret 2. It is provided in the indexing station. The punch 4 is connected to the ram 6 at a predetermined punch position P and driven up and down. The plate-shaped work W is fed back and forth and left and right on the work table 8 by the work holder 7 so that the desired position is located at the punch position P. Work holder 7
Is attached to a cross slide 10, and the cross slide 10 is installed on the frame 3 so as to be movable left and right (X direction) on a carriage 9 which is movable back and forth (Y direction).

The work table 8 is a flat table provided with a free bearing or the like in order to slide and move a flat work W on its upper surface. Therefore, for example, as shown in FIGS. 6A to 6D, when the burring molding portion 11, the dowel molding portion 12, the louver molding portion 13, and the like are molded, the reverse of the case of the drilling. The die 5, which is the lower die, has a convex shape so that the forming portions 11 to 13 are formed on the work W in an upward direction. In this case, since the stroke of the ram 6 is constant, the punch 4 is shortened and the die 5
The upper surface position (die height) is set higher than the die for punching by the forming height H (FIG. 6D) of the forming portions 11 to 13. That is, the work W by the work table 8
The height H is higher than the mounting surface 8a.

As described above, in the case of the molding die 5, the molding die 5 is formed on the lower turret 2 in order to increase the die height.
, The work W is lifted by the die 5 even in the case of punching. Therefore, the machining accuracy is adversely affected, and the lower surface of the work W may be scratched or distorted. In addition, the adjacent indexing station may not be available.

In order to solve such a problem, the height of the molding die 5 can be adjusted by a fluid pressure actuating device, and the molding die 5 is made to protrude only when it is used. No. 10111), and those in which a die is lifted by a cam or a fork-shaped member (Japanese Patent Publication No. 7-34939 and Japanese Utility Model Publication No. 7-184416) are proposed.

[0006]

However, since all of these are provided with the die raising / lowering mechanism for each die on the turret, when the number of molding dies installed is large, the die raising / lowering mechanism is increased accordingly. And the number of its driving sources also increased,
There is a problem that the cost is high.

The present invention solves the above problems, and provides a die raising / lowering mechanism of a turret punch press capable of raising / lowering a plurality of dies only by providing one die raising / lowering means for the turret. To aim.

[0008]

DISCLOSURE OF THE INVENTION A die lifting mechanism according to the present invention is a turret punch press in which molding dies capable of moving up and down are installed at a plurality of circumferential positions of a lower turret,
The die raising / lowering means for raising / lowering the die from below the lower turret is provided so as to act on one location of the rotation trajectory of the die accompanying the rotation of the lower turret. According to this configuration,
By rotating the turret and moving the molding die to a position corresponding to the die raising / lowering means, the die can be raised / lowered by the die raising / lowering means. Therefore, it is not necessary to provide die raising / lowering means for each die, and it is possible to raise / lower a plurality of dies only by providing one die raising / lowering means for the turret.

In the above structure, a protrusion may be provided below the lower turret below the lower surface of the lower turret, and the die elevating means may act on the protrusion.
As a result, the die elevating means can be arranged without being caught by the hole or the turret in which the die is arranged.
In other words, there is less restriction on the layout range of the die lifting means,
The range that can be covered expands. Further, the die lifting means is
It may be configured by an advancing / retreating member having a slanting surface portion on which the projecting portion can be mounted and a horizontal plane portion continuing to the upper end of the slanting surface portion, and capable of advancing / retreating in the horizontal direction, and an actuator for advancing / retreating the advancing / retreating member. In this configuration, the die is not directly moved up and down but indirectly moved up and down by the inclined surface of the advancing / retreating member and can be placed on the horizontal surface portion in the ascended state. The actuator can reliably maintain the die in the raised position.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. This embodiment is applied to the turret punch press having the schematic configuration described with reference to FIG. 5, and the portions corresponding to those in FIG. As shown in FIG. 3, a plurality of dies 5 are installed on the lower turret 2 along the circumferential direction via respective die holders 15. Of these, any of the plurality of dies 5 is for molding and can be raised and lowered. Die elevating means 16 (FIG. 2) for elevating and lowering the die 5 from below the lower turret 2 is provided so that the die 5 is acted on at one position of the rotation locus L accompanying the rotation of the lower turret 2 of these dies 5. In this example, the one position is the punch position P. The die raising / lowering means 16 is composed of an advancing / retreating member 17 having an inclined surface portion 17a and an actuator 18 for advancing / retreating thereof, as will be described later.

As shown in FIG. 1, the die holding table 15 comprises a holding table base 19 and a holding table body 20 mounted on the holding table base 19.
The holding base 19 is bolted to the upper surface of the lower turret 2. The holding table body 20 is installed on the holding table base 19 so as to be pulled out in the radial direction of the turret, and the positioning pin 2
1 and a lock pin (not shown). Work guide means such as a free bearing 22 for guiding the work at a substantially die height DH is provided on the upper surface of the holding table body 20. A die mounting hole 23 with a counterbore penetrating through the holding table body 20 and the holding table base 19 is formed substantially at the center of the die holding table 15, and a cylindrical die outer case 24 which is a component of the die 5 is formed. It is attached in a fitted state. An annular protrusion 24 a protruding from the outer periphery of the upper end of the outer die case 24 is engaged with the counterbore surface of the die mounting hole 23. The lower portion of the outer die case 24 projects downward from the holding base 19 and is provided in the lower turret 2 with the die mounting hole 2
It is inserted in 8.

The die 5 has a die mold part 5a which is a convex mold for molding, a die holder 25 having the die mold part 5a attached to the upper end thereof, the die outer case 24, and an ejector plate 27. A bolt head of a bolt 29 for mounting the die mold 5a to the die holder 25 is projected below the lower surface 2a of the lower turret 2 as a projection 29a that engages with the die elevating means 16. The protruding portion 29a has a circular shape having a flat surface portion on the side surface. The bolt 29 is inserted through the central hole of the die holder 25 and the male screw portion 29b at the upper end is inserted.
Is screwed onto the lower surface of the die mold 5a, and the projecting portion 29a, which is a bolt head, is engaged with the lower surface of the die holder 25 and tightened. A punching shim 34 is interposed between the protrusion 29a and the lower surface of the die holder. The bolt 29 is a female screw portion 35 for retaining that is provided on the inner surface of the central hole of the die holder 25.
An intermediate male screw portion 29c that is screwed with is formed. The intermediate male screw portion 29c is provided to prevent the bolt 29 from falling off during disassembly, and is located above the female screw portion 35 for retaining in the attached state of the die die 5a.

The die holder 25 is formed in the shape of a stepped shaft having a large diameter in the upper portion, and is fitted in a vertically movable guide hole 30 provided in the die outer case 24 so as to be vertically movable. The outer die case 24 has a built-in return means 31 for elastically lowering and returning the die holder 25. This return means 31
Is composed of a return spring 31a and a stripper bolt 31b. The stripper bolt 31b is inserted into a return means accommodating hole formed in the lower surface of the die outer case 24 and penetrates the bottom surface thereof, and the upper end of the large diameter portion of the die holder 25. Is screwed to. The return spring 31a is composed of a coil spring, and is interposed between the bolt head and the bottom surface of the return means accommodating hole on the outer circumference of the stripper bolt 31b. The ejector plate 27 is supported by the die holder 25 so as to be able to move up and down by the guide pin 32, and is urged upward by the ejector spring 33. Guide pin 3
2 vertically penetrates the hole provided in the die holder 25,
The upper end position of the ejector plate 27 is regulated by engaging the pin head portion at the lower end with the counterbore surface of the hole.

As shown in FIGS. 2B and 4, the advancing / retreating member 17 of the die raising / lowering means 16 traverses the slag discharge hole 37 of the punch reaction force receiving member 36 provided at the punch position P of the frame 3. As described above, the punch reaction force receiving member 36 is installed so as to be movable back and forth. The advancing / retreating direction of the advancing / retreating member 17 is perpendicular to the radial direction of the lower turret 2, and a pair of guide members 38, 39 installed on the punch reaction force receiving member 36 (see FIG. 2).
(A) and FIG. 4 (B)), the advancing / retreating direction is restricted. A guide groove 40 is formed on the side surface of the advancing / retreating member 17 on the turret center side, and the advancing / retreating is also guided by a plurality of guide rollers 41, 42 rolling in the guide groove 40. These guide rollers 41, 42 are installed on the frame 3, and one guide roller 42
When the advancing / retreating member 17 is in the advancing position, the guide groove 4
It deviates from 0. In addition, in FIG. 1, for convenience of description, the advancing / retreating direction of the advancing / retreating member 17 is shown different from the actual direction by 90 °.

The advancing / retreating member 17 has a trapezoidal bulge 17c (FIG. 4 (A)) having a tapered planar shape on the upper surface, and the tip end side portion thereof is inclined to the tip end side.
7a, the base end side portion is a horizontal surface portion 17b. Due to the inclined surface portion 17a and the horizontal surface portion 17b, the advancing / retreating member 17 has a trapezoidal shape (FIG. 2B) in a side view. The actuator 18 is composed of a fluid pressure cylinder, and the front end of its piston rod is connected to the rear end of the advancing / retreating member 17 by a connecting member 43. Actuator 18
Is attached to the frame 3 via the mounting base 44 so that the whole is located below the lower turret 2 at a position closer to the center of the lower turret 2 with respect to the punch position P. Thus, by housing the actuator 18 below the lower turret 2, the actuator 18 does not project outside the turret, and the entire machine becomes compact. It should be noted that the advancing / retreating member 17 is provided with sensors 45, 46 for detecting the forward end and the backward end thereof, respectively.
A proximity sensor or the like that detects the connecting member 17 is used as the unit 6. Further, a chip prevention guide 48 is attached to the tip end surface of the advancing / retreating member 17, and a chip prevention guide 49 facing the chip prevention guide 48 is provided on the frame 3 via an adjusting screw 50. Also,
Projection 2 of each die 5 for molding provided on the lower turret 2.
9a is provided at the center of the die holder 25,
Moreover, they are arranged so as to follow the same rotation locus L.

The operation of the above configuration will be described. Except when performing the forming process, that is, during the normal drilling process or rotation of the turret, the advancing / retreating member 17 is retracted to the retracted position out of the slag discharge hole 37 as shown by the solid line in FIG. deep. When performing the forming process, after the turret is indexed and rotated, the advancing / retreating member 17 is advanced to the advancing end by the actuator 18, as shown in FIG. 2 or as shown by the chain line in FIG. 4 (B). Along with this forward movement, the protruding portion 29a on the lower surface of the molding die 5 rides up on the inclined surface portion 17a of the advancing / retreating member 17 and moves on the horizontal surface portion 17b. Therefore, the die die part 5a of the die 5 rises together with the die holder 25 against the return spring 31a, and the upper end of the die die part 5a is held at a working height slightly higher than the die height DH for drilling. . When the advancing / retreating member 17 advances to the advancing end, the front / rear portion of the advancing / retreating member 17 crosses the slag discharge hole 37 and rests on the punch reaction force receiving member 36. Therefore, the pressing force of the punch 4 at the time of molding is received by the punch reaction force receiving member 36 from the die holder 25 and the protruding portion 29 a via the advancing / retreating member 17. Since the advancing / retreating member 17 is provided at the punch position P, it can be moved up and down with respect to any die 5 of the lower turret 2. When the forming process is completed, the advancing / retreating member 17 is retracted again, and the die holder 25 is lowered by gravity and forced return by the return spring 31a, so that the upper end surface of the die die part 5a is submerged below the die height DH. As a result, it is possible to prevent the back surface of the work from being scratched by the molding die 5 and to prevent the work from flapping when the work is fed, so that the work can be fed without lowering the feeding speed.

According to this die lifting mechanism,
A plurality of dies 5 can be moved up and down only by providing individual die elevating means 16. Therefore, it is not necessary to provide the die raising / lowering means or the actuator for each of the molding dies 5, and the structure is simple and the cost can be reduced. Further, since the die 5 is not directly moved up and down from below, but is indirectly moved up and down by the advancing and retracting member 17, the punch load of the die 5 does not act on the actuator 18, and the die 5 is surely moved to the raised position during the molding process. Can be maintained at. Further, since the protrusions 29a of the respective molding dies 5 provided on the lower turret 2 are both provided at the center of the die holder 25 and arranged so as to follow the same rotation locus L, a plurality of moldings are formed. The die 5 can be raised and lowered without any problem even if the die holder 25 and the like have different sizes. Moreover, since the center of the die holder 25 is pushed and moved up and down, there is no eccentricity of the die holder 25, and the die 5 can be smoothly moved up and down.

[0018]

According to the die raising / lowering mechanism of the turret punch press of the present invention, the die raising / lowering means for raising / lowering the die from the lower side of the lower turret acts on one position of the rotation trajectory of the die accompanying the rotation of the lower turret. Since the turret is provided, a plurality of dies can be raised and lowered by providing only one die raising / lowering means for the turret. In this configuration, a protrusion may be provided at the bottom of the die, and the die elevating means may be configured to act on the protrusion. As a result, the die elevating means can be arranged without being caught by the hole or the turret in which the die is arranged, the restriction on the arrangement range of the die elevating means is reduced, and the arrangeable range is expanded. The die raising / lowering means may be configured by an advancing / retreating member having an inclined surface portion and a flat surface portion on which the projecting portion can be mounted, and an actuator for driving the advancing / retreating portion. With such a configuration, the die having a small output can reliably maintain the die in the raised position.

[Brief description of drawings]

FIG. 1 is an explanatory diagram in which a cross-sectional view of a die lifting mechanism according to an embodiment of the present invention and a diagram schematically showing some components are combined.

FIG. 2A is a plan view of the die lifting mechanism, and FIG. 2B is a cutaway front view thereof.

FIG. 3 is a partially omitted plan view of a lower turret.

FIG. 4A is an operation explanatory view of the advancing / retreating member, and FIG. 4B is an explanatory view of the advancing / retreating member and its peripheral parts viewed from the front in the advancing / retreating direction.

FIG. 5 is a schematic side view of a conventional turret punch press.

6 (A), (B), and (D) are cross-sectional views of various conventional forming examples, and (C) is a perspective view of another forming example.

[Explanation of symbols]

2 ... Lower turret, 2a ... Lower surface, 3 ... Frame, 4 ... Punch, 5 ... Die, 5a ... Die mold part, 15 ... Die holding base,
16 ... Die raising / lowering means, 17 ... Advancing / retracting member, 17a ... Sloping surface part, 17b ... Horizontal surface part, 18 ... Actuator, 19 ...
Holding base, 20 ... Holding body, 22 ... Free bearing, 23 ... Die mounting hole, 24 ... Die outer case, 25 ... Die holder, 27 ... Ejector plate, 28 ... Die installation hole, 29 ... Bolt, 29a ... Projection part , 30 ... Elevating guide hole, 31 ... Returning means, 33 ... Ejector spring, 34 ... Shim, 36 ... Punch reaction force receiving member, 37 ... Slag discharge hole,
DH ... Die height, L ... Rotation locus, P ... Punch position (1
Location)

Claims (3)

[Claims] 1. A lower turret is provided with mold dies capable of ascending and descending at a plurality of positions in the circumferential direction, and die raising and lowering means for raising and lowering the die from below the lower turret is provided with A die lifting mechanism for a turret punch press, which is installed so as to act on one location on the rotation trajectory. 2. A die for a turret punch press according to claim 1, wherein a protruding portion that protrudes from a lower surface of the lower turret is provided at a lower portion of the die, and the die elevating means acts on the protruding portion. Lifting mechanism. 3. A die advancing / retracting member, which has an inclined surface portion on which the projecting portion can be mounted and a horizontal plane portion continuing from the upper end of the inclined surface portion, and which is capable of advancing / retreating in the horizontal direction, and advancing / retreating the advancing / retreating member. The die raising / lowering mechanism of the turret punch press according to claim 2, which is constituted by an actuator.